scholarly journals Numerical Investigation on Fracture Initiation Properties of Interface Crack in Dissimilar Steel Welded Joints

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Longfei Zhao ◽  
Chendong Shao ◽  
Yasuhito Takashima ◽  
Fumiyoshi Minami ◽  
Fenggui Lu
Keyword(s):  
Numerical Investigation ◽  
Interface Crack ◽  
Welded Joints ◽  
Fracture Initiation ◽  
Dissimilar Steel

Experimental and numerical investigation on fatigue performance of non-load-carrying fillet welded joints

2017 ◽  
Vol 130 ◽  
pp. 193-201 ◽  
Author(s):  
Liang Zong ◽  
Gang Shi ◽  
Yuan-Qing Wang ◽  
Zhong-Xian Li ◽  
Yang Ding
Keyword(s):  
Numerical Investigation ◽  
Welded Joints ◽  
Fatigue Performance ◽  
Load Carrying

Fracture initiation, growth and effect on stress field: a numerical investigation

1998 ◽  
Vol 20 (12) ◽  
pp. 1673-1689 ◽  
Author(s):  
Stephen D. McKinnon ◽  
Ivan Garrido de la Barra
Keyword(s):  
Stress Field ◽  
Numerical Investigation ◽  
Fracture Initiation

scholarly journals HAZ Characterization and Mechanical Properties of QP980-DP980 Laser Welded Joints

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Junliang Xue ◽  
Peng Peng ◽  
Wei Guo ◽  
Mingsheng Xia ◽  
Caiwang Tan ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Welded Joints ◽  
Weld Zone ◽  
Fiber Laser Welding ◽  
Punch Force ◽  
Dislocation Interaction ◽  
Dissimilar Steel ◽  
Tensile Process ◽  
Steel Joints ◽  
Softened Zone

AbstractThe QP980-DP980 dissimilar steel joints were fabricated by fiber laser welding. The weld zone (WZ) was fully martensitic structure, and heat-affected zone (HAZ) contained newly-formed martensite and partially tempered martensite (TM) in both steels. The super-critical HAZ of the QP980 side had higher microhardness (~ 549.5 Hv) than that of the WZ due to the finer martensite. A softened zone was present in HAZ of QP980 and DP980, the dropped microhardness of softened zone of the QP980 and DP980 was Δ 21.8 Hv and Δ 40.9 Hv, respectively. Dislocation walls and slip bands were likely formed at the grain boundaries with the increase of strain, leading to the formation of low angle grain boundaries (LAGBs). Dislocation accumulation more easily occurred in the LAGBs than that of the HAGBs, which led to significant dislocation interaction and formation of cracks. The electron back-scattered diffraction (EBSD) results showed the fraction of LAGBs in sub-critical HAZ of DP980 side was the highest under different deformation conditions during tensile testing, resulting in the failure of joints located at the sub-critical HAZ of DP980 side. The QP980-DP980 dissimilar steel joints presented higher elongation (~ 11.21%) and ultimate tensile strength (~ 1011.53 MPa) than that of DP980-DP980 similar steel joints, because during the tensile process of the QP980-DP980 dissimilar steel joint (~ 8.2% and 991.38 MPa), the strain concentration firstly occurred on the excellent QP980 BM. Moreover, Erichsen cupping tests showed that the dissimilar welded joints had the lowest Erichsen value (~ 5.92 mm) and the peak punch force (~ 28.4 kN) due to the presence of large amount of brittle martensite in WZ and inhomogeneous deformation.

scholarly journals Forming and Properties of Friction Stir Welding Process for Dissimilar Mg Alloy

2015 ◽  
Vol 9 (1) ◽  
pp. 859-864
Author(s):  
Tielong Li ◽  
Zhenshan Wang
Keyword(s):  
Magnesium Alloy ◽  
Process Parameters ◽  
Welded Joints ◽  
Defect Formation ◽  
Base Material ◽  
Welding Process ◽  
Fracture Initiation ◽  
Line Defect ◽  
Influence Of Process Parameters ◽  
Friction Stir

For hot extrusions of magnesium alloy sheets, Dissimilar AZ80 and AZ31 were used, in which AZ80 was placed on advancing side and AZ31 on retreating side, using friction stir butt welding with different process parameters. Some defect-free welded joints with good weld surfaces could be obtained with some suitable welding conditions. The maximum tensile strength of welded joint which is 225.5 MPa can reach 98% that of the AZ31 base material. Influence of process parameters on defects, weld shaping and mechanical property were discussed systematically. And the microstructure of different zones was compared. The fracture of the welded joints takes place at the junction of mechanical heat affected zone and nugget zone in AZ31 magnesium alloy set retreating side, since existing difference in metallographic structure of alloy diversely suffered by heat, pressure and depositing impurities. Fracture initiation site may be the P line defect which should be eliminated, and the P line defect formation was analyzed.

scholarly journals Effect Range of the Material Constraint-II. Interface Crack

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 696 ◽  
Author(s):  
Yue Dai ◽  
Jie Yang ◽  
Lei Wang
Keyword(s):  
Interface Crack ◽  
Welded Joints ◽  
Integrity Assessment ◽  
Center Crack ◽  
Fracture Behaviors ◽  
Selection Of ◽  
Material Constraints

The selection of fracture behaviors used in the structure integrity assessment has significant implications on the accuracy of the assessment. The effect range of the material constraint is an important factor which effects the fracture behaviors of structures and exists in the different kinds of welded joints with the center crack. However, for the material constraint induced by an interface crack, which also appears widely in the welded joints, it is not clear whether the effect range exists or not. The further study of the effect range of the material constraint for the welded joints with interface crack is meaningful. Thus, in this study, different basic models with interface crack were designed, the fracture behaviors of these basic models under different material constraints were calculated, and the effect range of the material constraint induced by interface crack were studied. This study about the interface crack and the previous study about the center crack provide an additional basis for an accurate structure integrity assessment.

scholarly journals Experimental and numerical investigation of the fracture in steel welded joints

2018 ◽  
Vol 13 ◽  
pp. 1521-1526
Author(s):  
A. Prokhorov ◽  
A. Kostina. ◽  
A. Vedernikova ◽  
O. Plekhov ◽  
M. Menaka ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Welded Joints

Investigation of failure behavior of ferritic–austenitic type of dissimilar steel welded joints

2011 ◽  
Vol 18 (3) ◽  
pp. 999-1008 ◽  
Author(s):  
M.K. Samal ◽  
M. Seidenfuss ◽  
E. Roos ◽  
K. Balani
Keyword(s):  
Welded Joints ◽  
Failure Behavior ◽  
Dissimilar Steel
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